CN107702797B - Tunable pulse sequence generating device - Google Patents
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- CN107702797B CN107702797B CN201710770002.2A CN201710770002A CN107702797B CN 107702797 B CN107702797 B CN 107702797B CN 201710770002 A CN201710770002 A CN 201710770002A CN 107702797 B CN107702797 B CN 107702797B
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- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0977—Reflective elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a tunable pulse sequence generating device, which comprises a protection box and a platform arranged in the protection box, wherein an entrance hole and an exit hole are formed in the protection box, a supercontinuum generating module, a supercontinuum stretching module and a supercontinuum shaping module are arranged on the platform, the supercontinuum stretching module comprises a short-time window channel and a long-time window channel, a first foldable reflecting mirror is arranged between the supercontinuum generating module and the supercontinuum stretching module, and a second foldable reflecting mirror is arranged between the supercontinuum stretching module and the supercontinuum shaping module. The tunable pulse sequence generating device provided by the invention can generate the supercontinuum pulse sequence with selectable time window, adjustable pulse sequence time interval and time span, and has the advantages of novel structure, easiness in realization, simplicity in operation, high time resolution and high tuning speed.
Description
Technical Field
The invention belongs to the technical field of ultrafast process diagnosis, and particularly relates to a tunable pulse sequence generating device.
Background
In the ultra-fast time-resolved measurement technique, supercontinuum is an important detection method. The focused ultrashort pulse interacts with a nonlinear medium, and when the laser energy exceeds a threshold, the laser light passing through the medium can produce significant spectral broadening, and such ultrashort laser pulses can be used to detect a repeatable physical process. However, many processes are disposable and difficult to reproduce, such as changes in material properties under intense laser action. Because of the difference of strong laser pulses of different times, the structure and the property of the material, and the like, the material property under the action of strong laser is irreversible and cannot return to the original state. In addition, the processes of chemical reaction, biological growth and the like all face the problem that the current technical means are difficult to detect.
In many cases, the physical, chemical, etc. processes of interest occur not only very rapidly, but also in very small spaces. This requires that the detection technique not only has extremely high temporal resolution, but also has high spatial resolution. However, the current time resolution of CCD and CMOS for ultra-fast two-dimensional imaging is only 100ns, corresponding to a read speed of only 10 7 Frame rate/s. Although framing cameras and stripe cameras have been widely used for diagnosis of ultra-fast physical processes, researches have shown that cameras based on photoelectric conversion are subject to space charge and microchannel plate processing techniques, and space-time resolution is difficult to further improve; and such devices are extremely susceptible to interference from strong neutrons, gamma rays, electromagnetic noise, and the like; the use of existing imaging devices alone does not give an ultrafast process that evolves over time on a finer scale. Therefore, developing a new ultra-fast diagnostic technique is imperative. Face to face failure to repeatThe complex process, supercontinuum chirp broadening, is a very practical detection tool. As probe light, the probe light can give out the evolution process of the two-dimensional spatial distribution of the ultrafast process along with time.
The full-optical framing technology based on supercontinuum is an important way for realizing extremely fast process and extremely small space detection, and has become the trend of the development of the detection technology at the present stage. The method is characterized in that two-dimensional space evolution information in different time is spatially separated, and then recorded by using recording equipment such as CCD. The key of the technology is to divide and shape the light of the supercontinuum probe. The supercontinuum is divided into sub-pulse sequences comprising components of different wavelengths by a special method, each sub-pulse sequence corresponding to a different instant. When the sub-pulse sequence passes through the object to be measured, the information to be measured is carried. In order to meet the requirements of different ultrafast space-time evolution processes, the generation of the supercontinuum pulse sequence with selectable time windows and adjustable time intervals is critical, so that the development of a generating device capable of generating the supercontinuum pulse sequence with selectable time windows and adjustable time intervals of the pulse sequence becomes urgent.
Disclosure of Invention
In order to solve the technical problems, the invention provides a tunable pulse sequence generating device which can generate a supercontinuum pulse sequence with selectable time window and adjustable pulse sequence time interval and time span.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the utility model provides a tunable pulse sequence generating device, includes protection box and sets up the platform in this protection box be equipped with into perforation and exit hole on the protection box, its main points lie in: the device comprises a platform, a super-continuous spectrum generation module, a super-continuous spectrum broadening module and a super-continuous spectrum shaping module, wherein the super-continuous spectrum broadening module comprises a short-time window channel and a long-time window channel, a foldable first reflecting mirror is arranged between the super-continuous spectrum generation module and the super-continuous spectrum broadening module, and a foldable second reflecting mirror is arranged between the super-continuous spectrum broadening module and the super-continuous spectrum shaping module; when the first reflecting mirror and the second reflecting mirror are unfolded, the ultra-short pulse laser incident from the incident hole generates ultra-continuous spectrum white light through the ultra-continuous spectrum generating module, the ultra-continuous spectrum white light enters a short time window channel through the first reflecting mirror to be widened to form a first ultra-continuous spectrum, and the ultra-continuous spectrum enters a super-continuous spectrum shaping module through the second reflecting mirror to be shaped to form a series of sub-pulse sequences; when the first reflecting mirror and the second reflecting mirror are folded, the ultra-short pulse laser incident from the incident hole generates ultra-continuous spectrum white light through the ultra-continuous spectrum generating module, the ultra-continuous spectrum white light enters a long-time window channel to be widened to form a second ultra-continuous spectrum, and the second ultra-continuous spectrum enters a super-continuous spectrum shaping module to be shaped to form a series of sub-pulse sequences; wherein, the time span of the first supercontinuum is smaller than the time span of the second supercontinuum.
By adopting the structure, the first reflecting mirror and the second reflecting mirror can be unfolded or folded according to actual requirements, so that ultra-short pulse laser can selectively enter a short-time window or a long-time window through the ultra-continuous spectrum white light generated by the ultra-continuous spectrum generating module; the supercontinuum white light is dispersed in a short time window channel to form a chirped and widened supercontinuum I, and the time span is ps magnitude (10 -12 Second), typically tens of ps, the supercontinuum white light forms a chirped and broadened supercontinuum two after dispersion in a long-time window channel, the time span of which is of the order of ns (10 -9 Seconds), typically a few ns; the super-continuous spectrum I or the super-continuous spectrum II is shaped by a super-continuous spectrum shaping module to form a series of sub-pulse sequences, each sub-pulse comprises different wavelength components and corresponds to different time, the function of generating the super-continuous spectrum pulse sequences with selectable time windows and adjustable pulse sequence time intervals and time spans is realized, and the super-continuous spectrum pulse sequences can be used as detection light to detect an ultra-fast process, and are beneficial to grasping the evolution behavior of the ultra-fast process and analyzing the inherent physical mechanism of the evolution behavior of the ultra-fast process.
As preferable: the short-time window channel comprises a third reflecting mirror, a fourth reflecting mirror and a glass rod; the super-continuum white light incident from the first reflector is emitted to the glass rod through the third reflector, and the super-continuum formed by stretching of the glass rod is emitted to the second reflector through the fourth reflector. By adopting the structure, the super-continuous spectrum I with chirp spread is formed by dispersing and spreading through the glass rod, the time span of the super-continuous spectrum I is only tens of ps, and the super-continuous spectrum I has ultrahigh time resolution.
As preferable: the long-time window channel comprises a first collimating objective, a second collimating objective and an optical fiber assembly; the supercontinuum white light incident from the supercontinuum generation module is collimated by the first collimating lens and then emitted to the optical fiber assembly, and the supercontinuum second formed by stretching of the optical fiber assembly is collimated by the second collimating lens and then emitted to the supercontinuum shaping module. By adopting the structure, the second supercontinuum with chirp broadening can be formed through the dispersion and broadening of the optical fiber component, the time span can reach a plurality of ns, and the second supercontinuum is not only in long-short fit with a short-time window channel, so that the time window is optional, but also the time resolution is far higher than that of the traditional 100ns, and the higher time resolution is realized.
As preferable: the optical fiber assembly comprises an optical fiber coupler I, an optical fiber coupler II and an optical fiber; the incident supercontinuum white light from the collimating objective lens is stretched by the optical fiber coupler I, the optical fiber and the optical fiber coupler II in sequence to form a supercontinuum II, and the supercontinuum II is emitted to the collimating objective lens II. By adopting the structure, the supercontinuum white light can be coupled into the optical fiber through the first optical fiber coupler, the formed supercontinuum II is emitted through the second optical fiber coupler and the second collimating objective lens, the length of the optical fiber can be selected according to actual needs, and the flexibility is high.
As preferable: the optical fiber adopts a photonic crystal optical fiber, and the glass rod adopts glass made of N-SF10 material. With the above structure, due to the relatively complex refractive index distribution of the cross section of the photonic crystal fiber, the photonic crystal fiber generally contains air holes in different arrangements, the dimensions of the air holes are approximately the same order of magnitude as the wavelength of the light wave and extend through the whole length of the device, and the supercontinuum can be limited to the propagation of the optical fiber core region with low refractive index.
As preferable: the first collimating objective and the second collimating objective are both arranged on the platform through a multi-dimensional adjusting bracket. With the structure, the first alignment objective and the second alignment objective can be aligned in multiple dimensions through the corresponding multi-dimensional adjusting brackets to perform posture adjustment so as to be matched with the optical fiber assembly.
As preferable: the supercontinuum generation module comprises a focusing lens, a nonlinear medium and an off-axis parabolic mirror; the ultra-short pulse laser incident from the incident hole is focused on a nonlinear medium through a focusing lens, and the supercontinuum white light generated by the nonlinear medium is collimated by an off-axis parabolic mirror and then is emitted to a supercontinuum broadening module. With the above structure, the focusing lens is used for focusing the ultra-short pulse laser on the nonlinear medium, the nonlinear medium is used for generating the supercontinuum white light, and the off-axis parabolic mirror is used for collimating the supercontinuum white light.
As preferable: the supercontinuum shaping module comprises a resonant cavity, wherein a first partial transflector and a second partial transflector which can be mutually close to or far away from each other are arranged in the resonant cavity; the first supercontinuum incident from the short-time window channel or the second supercontinuum incident from the long-time window channel is shaped by the first partial transflector and the second partial transflector in sequence to form a series of sub-pulse sequences. With the structure, the first partial lens and the second partial lens are parallel, the first or second supercontinuum is partially reflected by the first partial lens and partially transmitted, and when the transmitted part is incident to the second partial lens, the same part of light is reflected and partially transmitted, and finally the transmitted part becomes a series of sub-pulse sequences composed of different wavelength components and is led out of the device through the exit hole.
As preferable: the first translation stage is arranged on the platform in a sliding manner, the first partial lens and the second partial lens are respectively arranged on the first translation stage in a sliding manner through the second translation stage and the third translation stage, and at least one of the second translation stage and the third translation stage adopts a piezoelectric translation stage. By adopting the structure, the accurate adjustment of the first position and the second position of the partial lens and the partial lens is realized.
As preferable: a filter adopting a short-wave pass filter is arranged between the supercontinuum generation module and the supercontinuum broadening module, and the filter is arranged on a platform through a bracket. With the structure, the residual incident ultrashort pulse laser can be filtered.
Compared with the prior art, the invention has the beneficial effects that:
the tunable pulse sequence generating device provided by the invention can generate the supercontinuum pulse sequence with selectable time window, adjustable pulse sequence time interval and time span, and has the advantages of novel structure, easiness in realization, simplicity in operation, high time resolution and high tuning speed.
Drawings
FIG. 1 is a schematic view of the structure of a first mirror and a second mirror in the unfolded state;
fig. 2 is a schematic structural view of the first and second reflecting mirrors in a folded state.
Detailed Description
The invention is further described below with reference to examples and figures.
Referring to fig. 1 and 2, a tunable pulse sequence generating device includes a protection box 24 and a platform 1 disposed in the protection box 24, an input hole 2 and an output hole 21 are disposed on the protection box 24, a supercontinuum generating module a, a supercontinuum stretching module B and a supercontinuum shaping module C are disposed on the platform 1, wherein the supercontinuum stretching module B includes a short-time window channel B1 and a long-time window channel B2, a foldable mirror one 6 is disposed between the supercontinuum generating module a and the supercontinuum stretching module B, and a foldable mirror two 10 is disposed between the supercontinuum stretching module B and the supercontinuum shaping module C. When the first reflecting mirror 6 and the second reflecting mirror 10 are unfolded, ultra-short pulse laser incident from the incident hole 2 generates ultra-continuous spectrum white light through the ultra-continuous spectrum generating module A, the ultra-continuous spectrum white light enters the short time window channel b1 through the first reflecting mirror 6 to be widened to form a first ultra-continuous spectrum, and the ultra-continuous spectrum enters the ultra-continuous spectrum shaping module C through the second reflecting mirror 10 to be shaped to form a series of sub-pulse sequences X; when the first reflecting mirror 6 and the second reflecting mirror 10 are folded, the ultra-short pulse laser incident from the incident hole 2 generates ultra-continuous spectrum white light through the ultra-continuous spectrum generating module A, the ultra-continuous spectrum white light enters the long-time window channel b2 to be widened to form a second ultra-continuous spectrum, and the second ultra-continuous spectrum enters the ultra-continuous spectrum shaping module C to be shaped to form a series of sub-pulse sequences X.
Wherein, the time span of the supercontinuum I is ps magnitude(10 -12 Seconds), typically tens of ps; the time span of the supercontinuum II is of ns magnitude (10 -9 Seconds), typically a few ns; the super-continuum spectrum I or the super-continuum spectrum II is shaped by a super-continuum spectrum shaping module to form a series of sub-pulse sequences, each sub-pulse comprises different wavelength components and corresponds to different time, the function of generating the super-continuum spectrum pulse sequence with selectable time window and adjustable time interval of the pulse sequence is realized, and the super-continuum spectrum pulse sequence can be used as detection light to detect an ultrafast process, thereby being beneficial to grasping the evolution behavior of the ultrafast process and analyzing the inherent physical mechanism of the evolution behavior of the ultrafast process.
Referring to fig. 1 and 2, the first mirror 6 includes a first mirror plate 6a and a first telescopic bracket 6b, the second mirror 10 includes a second mirror plate 10a and a second telescopic bracket 10b, and positions of the first mirror plate 6a and the second mirror plate 10a are respectively adjusted by the first telescopic bracket 6b and the second telescopic bracket 10 b. It should be noted that the first telescopic bracket 6b and the second telescopic bracket 10b may be replaced by other adjustment methods, such as folding, swinging, etc., as long as the adjustment of the positions of the first reflective mirror 6a and the second reflective mirror 10a can be achieved.
When the first telescopic bracket 6b and the second telescopic bracket 10b are in an unfolding state, the first reflecting mirror plate 6a is positioned between the supercontinuum generation module A and the long-time window channel b2, the second reflecting mirror plate 10a is positioned between the long-time window channel b2 and the supercontinuum shaping module C, supercontinuum white light emitted by the supercontinuum generation module A is reflected by the first reflecting mirror plate 6a to enter the short-time window channel b1, and supercontinuum emitted by the short-time window channel b1 is reflected by the second reflecting mirror plate 10a to enter the supercontinuum shaping module C.
When the first telescopic bracket 6b and the second telescopic bracket 10b are in a folded state, the first reflecting lens 6a is not positioned between the supercontinuum generation module A and the long-time window channel b2, and the second reflecting lens 10a is not positioned between the long-time window channel b2 and the supercontinuum shaping module C, supercontinuum white light emitted by the supercontinuum generation module A directly enters the long-time window channel b2, and supercontinuum second emitted by the long-time window channel b2 directly enters the supercontinuum shaping module C.
Referring to fig. 1, the short window channel b1 includes a third mirror 7, a fourth mirror 9, and a glass rod 8, wherein the third mirror 7 is located between the first mirror 6 and the glass rod 8, and the fourth mirror 9 is located between the glass rod 8 and the second mirror 10. Wherein, the glass rod 8 adopts the glass made of N-SF10 material, the length is different from a few centimeters to tens of centimeters, and the glass rod can be manually replaced according to the requirement. And silver protective films are plated on the first reflector 6, the second reflector 10, the third reflector 7 and the fourth reflector 9 to improve the reflectivity of the first reflector 6, the second reflector 10, the third reflector 7 and the fourth reflector 9.
The supercontinuum white light incident from the first reflector 6 is emitted to the glass rod 8 through the third reflector 7, and the supercontinuum formed by widening the glass rod 8 is emitted to the second reflector 10 through the fourth reflector 9.
Referring to fig. 2, the long-time window channel b2 includes a first collimator lens 11, a second collimator lens 15, and an optical fiber assembly, the first collimator lens 11 is located between the supercontinuum generation module a and the optical fiber assembly, the second collimator lens 15 is located between the optical fiber assembly and the supercontinuum shaping module C, and the first collimator lens 11 and the second collimator lens 15 are flat field achromatic objectives, whose clear range is larger than that of the common objective lens. The collimator objective 11 and the collimator objective 15 are mounted on the platform 1 by a multi-dimensional adjustment bracket 25. The optical fiber assembly comprises a first optical fiber coupler 13, a second optical fiber coupler 14 and an optical fiber 12. The first fiber coupler 13 is located at the front end of the optical fiber 12, the second fiber coupler 14 is located at the rear end of the optical fiber 12, the optical fiber 12 is a photonic crystal fiber, and the length of the fiber is from tens of centimeters to tens of meters, which is optional according to practical requirements.
The supercontinuum white light incident from the supercontinuum generation module A is collimated by the collimating objective lens I11 and then is emitted to the optical fiber coupler I13, the optical fiber coupler I13 couples the supercontinuum white light into the optical fiber 12, and the formed supercontinuum II is emitted to the collimating objective lens II 15 by the optical fiber coupler II 14 and is emitted to the supercontinuum shaping module C.
Referring to fig. 1 and 2, the supercontinuum generation module a includes a focusing lens 3, a nonlinear medium 4, and an off-axis parabolic mirror 5, wherein the focusing lens 3 is located between the input aperture 2 and the nonlinear medium 4, and the off-axis parabolic mirror 5 is located between the nonlinear medium 4 and the supercontinuum broadening module B. The off-axis parabolic mirror 5 is a low-scattering mirror that is capable of collimating incident light at a specific angle and with minimal scattering loss. The nonlinear medium can be replaced according to actual demands, the embodiment is preferably calcium fluoride, the thickness of the nonlinear medium is different from a few tenths of a millimeter to two millimeters, and the material can generate a strong supercontinuum in a visible light wave band.
The ultra-short pulse laser incident from the incident hole 2 is focused on a nonlinear medium 4 through a focusing lens 3, and the supercontinuum white light generated by the nonlinear medium 4 is collimated by an off-axis parabolic mirror 5 and then is emitted to a supercontinuum broadening module B.
Referring to fig. 1 and 2, a filter 23 using a short-wave filter is disposed between the supercontinuum generation module a and the supercontinuum broadening module B, and the filter 23 is mounted on the platform 1 through a bracket 22. The supercontinuum white light emitted after being collimated by the off-axis parabolic mirror 5 is emitted to the supercontinuum broadening module B after the residual incident ultrashort pulse laser is filtered by the filter 23.
Referring to fig. 1 and 2, the supercontinuum shaping module C includes a resonant cavity, in which a first partial mirror 16 and a second partial mirror 17 that can be close to or far from each other are disposed. The first translation stage 20 is slidably mounted on the platform 1, the first partial lens 16 and the second partial lens 17 are slidably mounted on the first translation stage 20 through the second translation stage 18 and the third translation stage 19 respectively, and at least one of the second translation stage 18 and the third translation stage 19 adopts a piezoelectric translation stage. It should be noted that the first partial mirror 16 and the second partial mirror 17 are parallel to each other and have a distance far greater than the wavelength, and the medium between the two mirrors is air. One effective mode is that one part of the transmission reflecting mirror of the resonant cavity is arranged on a common small translation stage capable of roughly adjusting the precision by 100 micrometers, and the other part of the transmission reflecting mirror is arranged on a piezoelectric translation stage, so that the front and back positions can be precisely adjusted, and the adjustment precision is 10 micrometers. In addition, the front surface of the first partial reflecting mirror 16 and the rear surface of the second partial reflecting mirror 17 are plated with a transmission enhancing film so as to ensure that a wide spectrum has high transmittance, and the rear surface of the first partial reflecting mirror 16 and the front surface of the second partial reflecting mirror 17 are plated with a reflecting film, wherein the reflectivity is 60-70%.
The supercontinuum I incident from the short-time window channel b1 or the supercontinuum II incident from the long-time window channel b2 is shaped by the partial mirror I16 and the partial mirror II 17 in sequence to form a series of sub-pulse sequences X, wherein each sub-pulse comprises different wavelength components, corresponds to different time and is finally output from the output hole 21.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a tunable pulse sequence generating device, includes protection box (24) and sets up platform (1) in this protection box (24) be equipped with into perforation (2) and exit hole (21), its characterized in that on protection box (24): the device comprises a platform (1), wherein a supercontinuum generation module (A), a supercontinuum stretching module (B) and a supercontinuum shaping module (C) are arranged on the platform (1), the supercontinuum stretching module (B) comprises a short-time window channel (B1) and a long-time window channel (B2), a foldable first reflecting mirror (6) is arranged between the supercontinuum generation module (A) and the supercontinuum stretching module (B), and a foldable second reflecting mirror (10) is arranged between the supercontinuum stretching module (B) and the supercontinuum shaping module (C);
when the first reflecting mirror (6) and the second reflecting mirror (10) are unfolded, ultra-short pulse laser incident from the incident hole (2) generates ultra-continuous spectrum white light through the ultra-continuous spectrum generating module (A), the ultra-continuous spectrum white light enters the short-time window channel (b 1) through the first reflecting mirror (6) to be widened to form a ultra-continuous spectrum I, and the ultra-continuous spectrum enters the ultra-continuous spectrum shaping module (C) through the second reflecting mirror (10) to be shaped to form a series of sub-pulse sequences (X);
when the first reflecting mirror (6) and the second reflecting mirror (10) are folded, ultra-short pulse laser incident from the incident hole (2) generates ultra-continuous spectrum white light through the ultra-continuous spectrum generating module (A), the ultra-continuous spectrum white light enters the long-time window channel (b 2) to be widened to form a second ultra-continuous spectrum, and the second ultra-continuous spectrum enters the ultra-continuous spectrum shaping module (C) to be shaped to form a series of sub-pulse sequences (X);
wherein, the time span of the first supercontinuum is smaller than the time span of the second supercontinuum;
the first reflecting mirror (6) comprises a first reflecting mirror plate (6 a) and a first telescopic support (6 b), the second reflecting mirror (10) comprises a second reflecting mirror plate (10 a) and a second telescopic support (10 b), and the positions of the first reflecting mirror plate (6 a) and the second reflecting mirror plate (10 a) are respectively adjusted through the first telescopic support (6 b) and the second telescopic support (10 b);
when the telescopic bracket I (6 b) and the telescopic bracket II (10 b) are in an unfolding state, the reflecting mirror II (10 a) is positioned between the long-time window channel (C) and the long-time window channel (B2) and the super-continuous spectrum generating module (A), the super-continuous spectrum white light emitted by the super-continuous spectrum generating module (A) is reflected by the reflecting mirror II (6 a) to enter the short-time window channel (B1), and the super-continuous spectrum emitted by the short-time window channel (b 1) is reflected by the reflecting mirror II (10 a) to enter the super-continuous spectrum shaping module (C);
when the telescopic support I (6 b) and the telescopic support II (10 b) are in a folded state, the reflection lens I (6 a) is not located between the supercontinuum generation module (A) and the long-time window channel (b 2), meanwhile, the reflection lens II (10 a) is not located between the long-time window channel (b 2) and the supercontinuum shaping module (C), supercontinuum white light emitted by the supercontinuum generation module (A) directly enters the long-time window channel (b 2), and supercontinuum II emitted by the long-time window channel (b 2) directly enters the supercontinuum shaping module (C).
2. The tunable pulse train generating apparatus of claim 1, wherein: the short time window channel (b 1) comprises a third reflecting mirror (7), a fourth reflecting mirror (9) and a glass rod (8);
the supercontinuum white light incident from the first reflecting mirror (6) is emitted to the glass rod (8) through the third reflecting mirror (7), and the supercontinuum formed by widening the glass rod (8) is emitted to the second reflecting mirror (10) through the fourth reflecting mirror (9).
3. The tunable pulse train generating apparatus according to claim 2, wherein: the long-time window channel (b 2) comprises a first collimating objective lens (11), a second collimating objective lens (15) and an optical fiber assembly;
the supercontinuum white light incident from the supercontinuum generation module (A) is collimated by the first collimating lens (11) and then is emitted to the optical fiber assembly, and the supercontinuum second formed by stretching of the optical fiber assembly is collimated by the second collimating lens (15) and then is emitted to the supercontinuum shaping module (C).
4. A tunable pulse train generating device according to claim 3, wherein: the optical fiber assembly comprises an optical fiber coupler I (13), an optical fiber coupler II (14) and an optical fiber (12);
the supercontinuum white light incident from the first collimating objective lens (11) is stretched by the first optical fiber coupler (13), the optical fiber (12) and the second optical fiber coupler (14) in sequence to form a supercontinuum second, and the supercontinuum second is emitted to the second collimating objective lens (15).
5. The tunable pulse train generator of claim 4, wherein: the optical fiber (12) adopts a photonic crystal optical fiber, and the glass rod (8) adopts glass made of N-SF10 material.
6. The tunable pulse train generating apparatus according to any one of claims 3 to 5, wherein: the first collimating objective (11) and the second collimating objective (15) are both arranged on the platform (1) through a multi-dimensional adjusting bracket (25).
7. The tunable pulse train generating apparatus of claim 1, wherein: the supercontinuum generation module (A) comprises a focusing lens (3), a nonlinear medium (4) and an off-axis parabolic mirror (5);
the ultra-short pulse laser incident from the incident hole (2) is focused on a nonlinear medium (4) through a focusing lens (3), and the supercontinuum white light generated by the nonlinear medium (4) is collimated by an off-axis parabolic mirror (5) and then is emitted to a supercontinuum broadening module (B).
8. The tunable pulse train generating apparatus of claim 1, wherein: the super-continuum spectrum shaping module (C) comprises a resonant cavity, wherein the resonant cavity is provided with a partial first lens (16) and a partial second lens (17) which can be mutually close to or far away from each other;
the supercontinuum I which is incident from the short-time window channel (b 1) or the supercontinuum II which is incident from the long-time window channel (b 2) is shaped by the partial lens I (16) and the partial lens II (17) in sequence to form a series of sub-pulse sequences (X).
9. The tunable pulse train generator of claim 8, wherein: the first translation stage (20) is installed on the platform (1), the second partial lens (16) and the second partial lens (17) are installed on the first translation stage (20) in a sliding mode through a second translation stage (18) and a third translation stage (19) respectively, and at least one of the second translation stage (18) and the third translation stage (19) adopts a piezoelectric translation stage.
10. The tunable pulse train generating apparatus of claim 1, wherein: a filter (23) adopting a short-wave filter is arranged between the supercontinuum generation module (A) and the supercontinuum broadening module (B), and the filter (23) is arranged on the platform (1) through a bracket (22).
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